11 31 028 Removing and installing/replacing exhaust camshaft (B36A/B38A)

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Special tools required:

11 9 000

Necessary preliminary tasks:

Remove EXHAUST CAMSHAFT ADJUSTER

Removal:

Release all screws in the sequence 1 - 4 in half-turns.

Remove both bearing caps (5 and 6).

Fig 1: Exhaust Camshaft Bearing Caps Screws Tightening/Loosening Sequence

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Remove roller tappet (1).

Release all screws (2) evenly.

Remove high-pressure pump bracket (3).

Fig 2: Roller Tappet And High Pressure Pump Bracket

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Take exhaust camshaft (1) out of cylinder head.

Fig 3: Removing Exhaust Camshaft Out Of Cylinder Head

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Installation:

IMPORTANT: Removal on engine:
Set engine to ignition TDC at cylinder No. 1.
Removed cylinder head:
When using special tool 11 9 000 , it will be necessary to remove the aluminium strip.

Moisten all bearing positions (1) with engine oil.

Fig 4: Locating Bearing Positions

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Installation note:

Prior to installation of exhaust camshaft, ensure proper installation position of rocker arm (1).

Coat exhaust camshaft and bearing caps with engine oil.

Fig 5: Locating Rocker Arm

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IMPORTANT:

Rotate exhaust camshaft approximately 80° in direction of engine rotation to first cylinder top dead center and screw in place.

The cam on the exhaust camshaft on the first cylinder points towards the middle of the engine.

After tightening the bearing shells, the exhaust camshaft on the mounting flats must be rotated back to first cylinder top dead center.

Fig 6: Exhaust Camshaft Cam Position At First Cylinder

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Coat both bearing positions on high pressure pump carrier (3) with engine oil.

Position high pressure pump carrier (3) on cylinder head.

Tighten all screws (2).

Tightening torque 11 31 1AZ .

Install roller tappet (1).

Fig 7: Roller Tappet And High Pressure Pump Bracket

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NOTE: The bearing cap (1) of the exhaust camshaft is a thrust bearing.

The bearing cap (1) is legibly labelled "A" from the intake side.

The bearing cap (2) is legibly labelled "A1" from the intake side.

Fig 8: Bearing Cap Labels

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Coat exhaust camshaft and bearing caps with engine oil.

Position both bearing caps on cylinder head.

Tighten screws in the sequence 4 - 1.

Tightening torque 11 31 1AZ .

Fig 9: Exhaust Camshaft Bearing Caps Screws Tightening/Loosening Sequence

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Required follow-up work:

Adjust VALVE TIMING .